diff --git a/rust/perspective-viewer/src/less/column-selector.less b/rust/perspective-viewer/src/less/column-selector.less
index 9c3f0651c3..3b7651ddc0 100644
--- a/rust/perspective-viewer/src/less/column-selector.less
+++ b/rust/perspective-viewer/src/less/column-selector.less
@@ -70,12 +70,12 @@
 
         .dragdrop-highlight {
             .column_selector_draggable.dragover,
-            .column-selector-column:not(:last-child):not(:nth-last-child(2))
+            .column-selector-column:not(:last-child):not(:nth-last-child(2)):not(:nth-last-child(3))
                 .column_selector_draggable {
                 border-bottom-color: var(--active--color) !important;
             }
 
-            .column-selector-column:not(:first-child):not([data-label])
+            .column-selector-column:not(:first-child):not([data-label]):not(:nth-last-child(2))
                 .column_selector_draggable.dragover {
                 border-top-color: rgb(0 0 0 / 5%) !important;
             }
@@ -113,18 +113,18 @@
             span.expression-delete-button {
                 padding-right: 1.5px;
                 padding-left: 5px;
-                
+
                 &::before {
-                    content: var(--column-close--content, "close")
+                    content: var(--column-close--content, "close");
                 }
             }
 
             span.expression-edit-button {
                 padding-left: 1.5px;
                 padding-right: 3px;
-                
+
                 &::before {
-                    content: var(--column-menu--content, "menu")
+                    content: var(--column-menu--content, "menu");
                 }
             }
 
@@ -239,6 +239,21 @@
             font-size: var(--column-selector--font-size, 14px);
         }
 
+        #active-columns.collapse {
+            .column-selector-column:nth-last-child(3) {
+                .column_selector_draggable {
+                    border-color: transparent;
+                }
+            }
+        }
+
+        #active-columns:not(.collapse).dragdrop-highlight {
+            .column-selector-column:not(:last-child):not(:nth-last-child(2))
+                .column_selector_draggable {
+                border-bottom-color: var(--active--color) !important;
+            }
+        }
+
         #active-columns,
         #sub-columns {
             flex: 0 1 auto;
diff --git a/rust/perspective-viewer/src/rust/components/column_selector.rs b/rust/perspective-viewer/src/rust/components/column_selector.rs
index 60713cbe7c..178eacbc04 100644
--- a/rust/perspective-viewer/src/rust/components/column_selector.rs
+++ b/rust/perspective-viewer/src/rust/components/column_selector.rs
@@ -167,6 +167,11 @@ impl Component for ColumnSelector {
                     .and_then(|x| from_index.map(|from_index| from_index < x))
                     .unwrap_or_default()
                     && is_to_empty
+                    || from_index
+                        .map(|from_index| {
+                            from_index == config.columns.len() - 1 && to_index > from_index
+                        })
+                        .unwrap_or_default()
                 {
                     ctx.props().dragdrop.drag_leave(DragTarget::Active);
                     true
@@ -271,7 +276,9 @@ impl Component for ColumnSelector {
                 active_classes.push("dragdrop-highlight");
             };
 
-            if config.columns.len() != all_columns.len() + config.expressions.len() {
+            if config.columns.iter().filter(|x| x.is_some()).count()
+                != all_columns.len() + config.expressions.len()
+            {
                 active_classes.push("collapse");
             }
 
diff --git a/rust/perspective-viewer/src/rust/components/containers/scroll_panel.rs b/rust/perspective-viewer/src/rust/components/containers/scroll_panel.rs
index 1e9f29d94f..6df92e3ffc 100644
--- a/rust/perspective-viewer/src/rust/components/containers/scroll_panel.rs
+++ b/rust/perspective-viewer/src/rust/components/containers/scroll_panel.rs
@@ -173,7 +173,8 @@ where
                 let start_node = if scroll_top > named_col_section_height {
                     max!(
                         0,
-                        ((scroll_top / ctx.props().row_height).floor() as usize
+                        (((scroll_top - named_col_section_height) / ctx.props().row_height).floor()
+                            as usize
                             + ctx.props().named_row_count) as isize,
                     ) as usize
                 } else {
diff --git a/rust/perspective-viewer/src/rust/model/columns_iter_set.rs b/rust/perspective-viewer/src/rust/model/columns_iter_set.rs
index c9eadd6e81..0baa9f9e18 100644
--- a/rust/perspective-viewer/src/rust/model/columns_iter_set.rs
+++ b/rust/perspective-viewer/src/rust/model/columns_iter_set.rs
@@ -63,27 +63,47 @@ impl<'a> ColumnsIteratorSet<'a> {
             .as_ref()
             .map_or(0, |x| x.len());
 
+        let named_columns = self.renderer.metadata().names.clone().unwrap_or_default();
+        let last_col = self.config.columns.last().and_then(|x| x.as_ref());
+        let has_blank_tail = last_col.is_none()
+            || self.config.columns.len() < named_columns.len()
+            || self.config.columns.iter().filter(|x| x.is_some()).count()
+                == self
+                    .session
+                    .metadata()
+                    .get_table_columns()
+                    .map(|x| x.len())
+                    .unwrap_or_default()
+                    + self.config.expressions.len();
+
         match &self.is_dragover_column {
             Some((to_index, from_column)) => {
                 let is_to_swap = self.renderer.metadata().is_swap(*to_index);
                 let to_column = self.config.columns.get(*to_index);
                 let is_to_empty = to_column.map(|x| x.is_none()).unwrap_or_default();
-                let is_from_required = self
+                let from_index = self
                     .config
                     .columns
                     .iter()
-                    .position(|x| x.as_ref() == Some(from_column))
+                    .position(|x| x.as_ref() == Some(from_column));
+
+                let is_from_required = from_index
                     .and_then(|x| self.renderer.metadata().min.map(|y| x < y))
                     .unwrap_or_default();
 
-                let is_from_swap = self
-                    .config
-                    .columns
-                    .iter()
-                    .position(|x| x.as_ref() == Some(from_column))
+                let is_from_swap = from_index
                     .map(|x| self.renderer.metadata().is_swap(x))
                     .unwrap_or_default();
 
+                let is_dragover_last = *to_index == self.config.columns.len()
+                    || (*to_index == self.config.columns.len() - 1 && from_index.is_some());
+
+                let tail = if has_blank_tail || is_dragover_last {
+                    [].iter().cloned()
+                } else {
+                    [Some(&None)].iter().cloned()
+                };
+
                 if is_to_swap || is_from_required {
                     let all_columns = self.config.columns.iter().filter_map(move |x| match x {
                         Some(x) if x == from_column => {
@@ -104,7 +124,10 @@ impl<'a> ColumnsIteratorSet<'a> {
 
                     let after_cols = all_columns.skip(*to_index + 1).map(Some);
                     self.to_active_column_state(Box::new(
-                        before_cols.chain([None].iter().cloned()).chain(after_cols),
+                        before_cols
+                            .chain([None].iter().cloned())
+                            .chain(after_cols)
+                            .chain(tail),
                     ))
                 } else {
                     let to_offset = match to_column {
@@ -131,11 +154,24 @@ impl<'a> ColumnsIteratorSet<'a> {
 
                     let after_cols = all_columns.skip(to_offset).map(Some);
                     self.to_active_column_state(Box::new(
-                        before_cols.chain([None].iter().cloned()).chain(after_cols),
+                        before_cols
+                            .chain([None].iter().cloned())
+                            .chain(after_cols)
+                            .chain(tail),
                     ))
                 }
             }
-            _ => self.to_active_column_state(Box::new(self.config.columns.iter().map(Some))),
+            _ => {
+                let tail = if has_blank_tail {
+                    [].iter().cloned()
+                } else {
+                    [Some(&None)].iter().cloned()
+                };
+
+                self.to_active_column_state(Box::new(
+                    self.config.columns.iter().map(Some).chain(tail),
+                ))
+            }
         }
     }
 
@@ -180,7 +216,6 @@ impl<'a> ColumnsIteratorSet<'a> {
         };
 
         let col_set = self.config.columns.iter().collect::<HashSet<_>>();
-
         let mut filtered = values
             .filter_map(move |name| self.to_ordered_column(name, is_drag_active, &col_set))
             .collect::<Vec<_>>();
diff --git a/rust/perspective-viewer/test/results/results.json b/rust/perspective-viewer/test/results/results.json
index 68b7d6b848..4aa04439ad 100644
--- a/rust/perspective-viewer/test/results/results.json
+++ b/rust/perspective-viewer/test/results/results.json
@@ -3,7 +3,7 @@
     "superstore.html/doesn't leak elements.": "d0fd18b3d4d7c183c5ed155b4bf37972",
     "superstore.html/doesn't leak views when setting group by.": "54daaa4bbbe59f6ed4acc301ba871bab",
     "superstore.html/doesn't leak views when setting filters.": "6dfc1e505f1428424c3265f0236f22fc",
-    "__GIT_COMMIT__": "042876bc9248db7bd81b92f7d9422d9397fbc81f",
+    "__GIT_COMMIT__": "c641d251df413dba800a2a5bf330107a28bc1be6",
     "blank.html/Handles reloading with a schema.": "e58c62f6e0ff16dc4d753f99e0fc39c3",
     "superstore_shows_a_grid_without_any_settings_applied_": "ae1c4690d978598ca14c8669244ce604",
     "superstore_Responsive_Layout_shows_horizontal_columns_on_small_vertical_viewports_": "57ba3ad341cf8a0e4df6ab96715ff2a0",
@@ -62,23 +62,23 @@
     "superstore_save()_returns_the_current_config": "ded04b5d6cb96a3651578334f189b20e",
     "superstore_restore()_restores_a_config_from_save()": "ded04b5d6cb96a3651578334f189b20e",
     "superstore_restore()_fires_the__perspective-config-update__event": "ded04b5d6cb96a3651578334f189b20e",
-    "superstore_restore_fires_the__perspective-config-update__event": "06b1128d94ddb953f8c5b6adf49f4756",
-    "superstore_save_returns_the_current_config": "06b1128d94ddb953f8c5b6adf49f4756",
-    "superstore_restore_restores_a_config_from_save": "43141e5cf7c0554cce759d3f7ea16133",
+    "superstore_restore_fires_the__perspective-config-update__event": "87c349f24f967b3ca7710a350b26bc6f",
+    "superstore_save_returns_the_current_config": "87c349f24f967b3ca7710a350b26bc6f",
+    "superstore_restore_restores_a_config_from_save": "5bcbead8c4358e283301f2cae19af922",
     "Expressions_Click_on_add_column_button_opens_the_expression_UI_": "40bb9b2f39e1cd296752d42c694a4f05",
     "Expressions_Resetting_the_viewer_partially_should_not_delete_all_expressions": "e5a61cd8d6b3f02811ddcbacd4636889",
     "Expressions_Resetting_the_viewer_partially_when_expression_as_in_columns_field,_should_not_delete_all_expressions": "e5a61cd8d6b3f02811ddcbacd4636889",
     "superstore-all_restore__Bucket_by_year_": "e553e253c983516dea41eb584a889612",
     "superstore-all_restore__Plugin_config_color_mode_": "e15272040eea436c123116c69c11a3e8",
-    "dragdrop_superstore_drop_from_inactive_to_active_should_add": "d9647ef9ee823e5a755fd82f59bc17dd",
-    "dragdrop_superstore_drop_from_active_to_active_should_swap": "1bf37cc032feb970f7e13a8cfabd889e",
+    "dragdrop_superstore_drop_from_inactive_to_active_should_add": "fdd21108d1d0fe2cd4af227e80148244",
+    "dragdrop_superstore_drop_from_active_to_active_should_swap": "184362114cbed81e3738b7c6ec4eee4b",
     "dragdrop_column-selector-modes_drop_from_inactive_to_required_column_should_add": "cb444777492e047555dd2e7362342478",
-    "dragdrop_column-selector-modes_drop_from_required_to_required_should_swap": "fb99573ea6e099661c998768b7ba81a1",
+    "dragdrop_column-selector-modes_drop_from_required_to_required_should_swap": "44ef933dd1877da4e5a28e781b903ed7",
     "dragdrop_column-selector-modes_drop_from_required_to_empty_column_should_fail": "49315bb1d743aa90ed17ba765bfe62c6",
     "dragdrop_column-selector-modes_drop_from_inactive_to_empty_should_add": "4d64295b828cb74471cb5aaa8427fe97",
-    "dragdrop_column-selector-modes_drop_from_named_to_required_should_swap": "579b194ae62ed4efb1734a6e629705b6",
-    "dragdrop_column-selector-modes_drop_from_optional_to_empty_columns_should_move": "47e0f1e227cef782b9540c85d26192fd",
-    "dragdrop_column-selector-modes_dragover_from_named_to_required_columns_should_swap": "2ab795f33898c98faf0a7ffa4494975e",
-    "dragdrop_column-selector-modes_dragover_from_optional_to_empty_columns_should_move": "2aefefd091efd14886722404178e967d",
-    "dragdrop_column-selector-modes_dragover_from_optional_to_required_columns_should_swap": "fa41e3421003f99999ff3568f838bf08"
+    "dragdrop_column-selector-modes_drop_from_named_to_required_should_swap": "7f8a9471374f92b389db3ce95235f2fc",
+    "dragdrop_column-selector-modes_drop_from_optional_to_empty_columns_should_move": "5576999a454cff9b88ee67068ce87911",
+    "dragdrop_column-selector-modes_dragover_from_named_to_required_columns_should_swap": "052c1644607e755a3d1aeb341bb29434",
+    "dragdrop_column-selector-modes_dragover_from_optional_to_empty_columns_should_move": "3ace55714735edf6b242f2ee5a819cb8",
+    "dragdrop_column-selector-modes_dragover_from_optional_to_required_columns_should_swap": "93797970fabc6d024c7867c20ad4e47b"
 }
\ No newline at end of file